I have a new 2015 Super Crew XLT 2.7EB. So far 1,000 miles.
The truck rides good but I feel every bump on the road through the steering wheel. It feels like the tires have too much air in them. On the door it says 40 psi cold. Thats what I have them set at.
Now my other two trucks I had, Super Crew XLT '09 and '14 both said 35 psi on the door.
'09 and '14 came with Michelin tires.
'15 came with hankook tires.
Why would a truck thats suppose to be lighter run 40 psi?
Would it hurt to run them at 35 psi?

 

I believe that the door listed pressure is what you have to have to handle the rated axle gross weight listed on the sticker. Lower pressure would give a smother ride and lower both your mpg and load carrying numbers.

 

You could dropthem to 35 but you may not feel much of a difference. Keep in mind this is a new truck, the suspension will settle. Also keep in mind you probably have a tire monitor system on this truck and any drop in pressure may cause the light to come on. Todays vehicles are engineered for specific fuel economy and performance needs, I would stay with 40.

 

Thanks for the help.
I always run what the door says.
But it just seemed a little odd to run more psi on a lighter truck.

 

But it's not lighter when loaded to the GV limit!! Which the tire pressure is set for.

I know after a few miles, adding the cap and all the stuff I normally carry with me mine has smoothed out a lot.

 

I wouldn't over think it, drop the pressure to ~36 and drive it for a week and see how it feels. You can always air up when towing or hauling. Good luck.

 

Let's not confuse "cold pressure" with maximum pressure.

My truck came with the el cheapo Hankooks and my door plate states 38 PSI cold for 235-75-17 tires. I once aired them down to below 35 for a smoother ride and the truck felt squishy and the tires looked like they were slack, which of course they were.

I now have the BFG Rugged Terrains, 265-70-17. The sidewall states a max pressure of 44 PSI. The tire tech aired them to 38-40. I read a link and can't find it now that stated that tires should be run at 20% below Max Pressure.

I sure would like to read some of your thoughts on this.

 

I have a new 2015 XLT supercrew with the 6-1/2' box and it came with 275/65R18 Goodyears. The door sticker says 35 PSI, but I noticed the day we picked it up & the dealer was going over the controls, that the console display was 42 PSI all around.

Now you have me wondering....

 

It's a trick they use along with filling it up with pure gas not 90% stuff so your first impression is wow what good mileage I'm getting...

 

I wonder how much driving was done for the PDI or test drives beforehand.

On a warm day, I notice a 4-6 psi difference within a 12 mile (some highway) trip in the company truck.

 

I had to drive to town yesterday, and the OAT was ranging from ~~90 to 102 ( ouch ). I checked the TP on the console at one point and it was up to 47 PSI...

 

Has anyone compared the actual pressure versus what the display says?

 

I did the other day before driving home from cottage. Dash showed LF 34 RF 37 LR 34 RR 38. They were all at 38 when I got the truck 4/17/15. I filled/checked them with my dial air gage on my air hose starting with the RR it showed 38. I then filled them all up to 38 and doubled checked with my digital gage they all showed 38 then checked the dash all showed 38. Checked again on way home at rest area 103 miles into trip and dash showed all at 40, it was about 68F that night.

Door sticker calls for 35 with my tires but I always like running them a little higher. Took 9.5 gallons to go up north but only 8.5 coming home. This is normal that I burn more gas going up then coming home. Not sure if it's because going north is going up and coming home is going down, according to the globe anyways.. I'm sure it's not because I'm in more of a hurry to get up to the cottage than I am to get back home!

 

I see a lot of different tire sizes listed here with each different PSI. I am no tire expert, but wouldn't the size, ply, load rating all affect the PSI? I always check the PSI called for on the tire and try to be within a couple pounds of it. With everyone changing the cheap tires that come with the truck, it seems more logical to me to match what the tire manufacturer wants in them instead of what the door states. Again, NOT a tire expert, just my 0.02.

I agree that the rough ride could be a new truck(suspension) needing to wear.

 

Yes all that and the trucks empty weight and max weight, suspension all should be figure into the door sticker psi.

No way is a tire manufacturer going to know all this and put it on the tire. They tell you the max weight the tire can handle at the max pressure.
I prefer running 38 have been for years in my trucks no mater what the sticker says. Got 135,000 miles off the stock Goodyears on my 2002 F150. Only replaced them because of their age they still had a lot more miles on them.

True my truck doesn't ride as smooth as my 1995 J6 Jaguar but dam it's a truck!! And a nice one at that! And it has most of the neat things that the Jaguar has even if it took 20 years.